What is a current transformer?
发布时间：2025-02-08
The operating principle of a current transformer is based on electromagnetic induction. It uses small currents on the secondary side to replace the large primary current for metering purposes.
A current transformer consists of a closed core and windings. Indeed, its primary winding has very few turns and is connected in series with the circuit carrying the current to be measured.
Therefore, the total current flowing through it is typically quite large, and the secondary-side winding has a relatively high number of turns. It is connected to measuring instruments and protective circuits.
Protection.
When a current transformer is in operation, its secondary measurement circuit remains closed at all times; consequently, the resistance of the series‑connected coils in the measuring instruments and protective circuits is very low.
, which also causes the current transformer to operate closer to short-circuit conditions; in practice, the current transformer converts the large primary-side current into…
The secondary-side current is measured; the secondary circuit must not be open-circuited.
Its operating principle is also based on the fact that, in power generation, transmission, distribution, and consumption circuits, current magnitudes vary widely, ranging from a few amperes to several…
The current can range up to one hundred amperes. When a current transformer is used, it must be employed to convert the current for measurement, protection, and control purposes, in order to achieve relatively uniform…
In the case of current, the voltage on the other line is generally quite high. Direct measurement is extremely dangerous. At this point, the current transformer serves to electrically…
The functions of signal conversion and electrical isolation.
Current transformers are very similar to transformers; both operate on the principle of electromagnetic induction, except that transformers transform voltage.
Meanwhile, a current transformer transforms electric current. The function of a current transformer is to convert a relatively large primary current into a smaller secondary current through a specific transformation ratio.
The secondary current of the small-value winding is used for protection and measurement.
2024/06/29
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